package lab02.test36;

public class Postgradute extends Student {
    @Override
    String calGrade() {
        String grade="";
        double avg=average();

        if (avg >= 90 && avg <= 100)
            grade = "优秀";
        else if(avg>=80&&avg<90)
            grade="良好";
        else if(avg>=70&&avg<80)
            grade="一般";
        else if(avg>=60&&avg<70)
            grade="及格";
        else
            grade="不及格";
        return grade;
    }
}
